obama spent a couple of hours practicing yesterday, as well. and has three days set aside for more practice. it's nicknamed debate camp. and near the end of camp, like now, it's a full-on mock debate. following the time rules, podiums the exact distance apart, and fill-ins for the opposition. preparing joe biden. >> it's only tense when they give you the completely wrong answer. the goal is to make them feel that they're as real as possible. >> reporter: she believes romney has the harder chore. >> the idea that i'm anti-immigrant is repulsive. >> reporter: being aggressive against the president, drawing distinctions between the president, trying not to be nasty. >> i don't think i'm that bad. >> you're likable enough, hillary. >> thank you. >> reporter: and the president who can become impatient, is probably being pushed in practice, as well. >> part of having a tough opponent in your mock is that you get that anger out in the mock. so that the president is relatively calm and collected. >> reporter: there are reports out of the president's de